(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

the barrel of a rifle has a length of 0.916m. a bullet leaves the muzzle of a rifle with a speed of 642 m/s. (note: assume the acceleration in this is constant) what is the acceleration of the bullet while in the barrel? answer is m/s^2

2. Relevant equations

uhm i assume since im looking for A i got a=V(final)+V(initial) divided by t

3. The attempt at a solution

uhm what i have goten so far is V(i)= 0m/s? V(f) = 642 m/s and time as .0014267913 ?

i get a wacked number that i know isnt right haha. any help?

also my paper has 2-3 problems like the one im fixing to explain that im little confused on.

1. find the average acceleration during the time interval 3s to 6s. answer in m/s^2

so far i got that the velocity is 5m/s from 3 to 6? and i guess T= 3? im getting it wrong though the site says when i enter my answer.

2.find the instantaneous acceleration at 4 seconds. answer in m/s^2 uhm like earlier the velocity is 5m/s from 3s to 6 s. and i have no clue how to do that with the Acceleration formula my teacher gave me. any help helps

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# Homework Help: Im stuck on some problems.

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